I've imported selected parts of an excel spreadsheet. Then new rows were added to the original spreadsheet in Excel and I need to reflect those changes in the InDesign file. Can I go back to my import...

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The inexpensive photos are royalty-free which, to answer your questions, no, you would not be sole user of that artwork. For a trademarked image what you need is "rights managed" photography which is neither free or cheap. I would suggest the cat food company have a photo taken by a professional photographer.